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Quark is a special German Cheese, you are right. In Portuguese they would say "ricotta", I know the texture is different.

do you want me to change the translation and just put ricotta? or leave "quark cheese"? (I actually googled "quark cheese" and it seems like this word is really used )
or is the translation meant as a bridge to translate into portugese? then I guess I should change it. let me know...

(btw why don't you translate it yourself? looks like you speak both german and english fluently?)

My English is bad The translation is meant as a bridge to translate into portuguese, quark cheese is ok
I put "ricotta" for those who doesn't find "quark", because a brazilian friend told me they use "ricotta" or "philadelphia" cheese.

ok, I put it into the remarks section with little stars as you did, for those that will translate it into portuguese

quark cheese should be replaced by cottage cheese

but cottage cheese is "Hüttenkäse" and not "Quark", and it has little chunks, I wouldn't want it in my cake...

A quote from Wikipedia:

Quark (or qvark) is a fresh cheese of Central European origin. Dictionaries usually translate it as curd cheese. It is soft, white and un-aged, similar to fromage frais. It is not the same thing as cream cheese or cottage cheese. It is distinct from ricotta because ricotta (Italian: recooked) is made from scalded whey. It usually has much lower fat content (about the same as yoghurt) than cream cheeses and has no salt added.